There are several synonyms for the term "bad charge." Some common alternatives include "fraudulent charge," "unauthorized charge," "invalid charge," and "disputed charge." A bad charge can occur when a credit or debit card is used without proper authorization, or when an error is made during the transaction process. It is important to monitor your bank and credit card statements regularly to ensure that all charges are accurate and authorized. If you do notice a bad charge, it is recommended to contact your bank or credit card company immediately to dispute the charge and take any necessary actions to protect your financial information.